Giant Room Temperature Interface Spin Hall and Inverse Spin Hall Effects

Wang, Lei; Wesselink, Rien J. H.; Liu, Yi; Yuan, Zhe; Xia, Ke; Kelly, Paul J.

doi:10.1103/physrevlett.116.196602

Cited by 211 publications

(243 citation statements)

References 46 publications

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“…First principles calculations support the existence of an interfacial spin Hall effect [29,30] that could significantly exceed its bulk counterpart [29]. Experimental evidence suggests that the spin Hall angle becomes modified near the interface of Bi/Py bilayers, which also alludes to a distinct interfacial contribution to the spin Hall effect [31].…”

Section: Introductionmentioning

confidence: 85%

Spin transport at interfaces with spin-orbit coupling: Phenomenology

2016

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This paper presents the boundary conditions needed for drift-diffusion models to treat interfaces with spin-orbit coupling. Using these boundary conditions for heavy metal/ferromagnet bilayers, solutions of the drift-diffusion equations agree with solutions of the spin-dependent Boltzmann equation and allow for a much simpler interpretation of the results. A key feature of these boundary conditions is their ability to capture the role that in-plane electric fields have on the generation of spin currents that flow perpendicularly to the interface. The generation of these spin currents is a direct consequence of the effect of interfacial spin-orbit coupling on interfacial scattering. In heavy metal/ferromagnet bilayers, these spin currents provide an important mechanism for the creation of damping-like and field-like torques; they also lead to possible reinterpretations of experiments in which interfacial contributions to spin torques are thought to be suppressed.

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Section: Introductionmentioning

confidence: 85%

Spin transport at interfaces with spin-orbit coupling: Phenomenology

2016

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“…As recently observed, for metallic interfaces between a metallic ferromagnet and a nonmagnetic metal layer, interface effects can play a crucial role in determining the spin current effects and dominate the measured signals [23][24][25][26]. However, the interfaces between metals are different from insulator-metal interfaces where coupling tends to be more localized.…”

Section: Introductionmentioning

confidence: 90%

Influence of Thickness and Interface on the Low-Temperature Enhancement of the Spin Seebeck Effect in YIG Films

et al. 2016

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The temperature-dependent longitudinal spin Seebeck effect (LSSE) in heavy metal ðHMÞ=Y 3 Fe 5 O 12 (YIG) hybrid structures is investigated as a function of YIG film thickness, magnetic field strength, and different HM detection materials. The LSSE signal shows a large enhancement with reductions in temperature, leading to a pronounced peak at low temperatures. We find that the LSSE peak temperature strongly depends on the film thickness as well as on the magnetic field. Our result can be well explained in the framework of magnon-driven LSSE by taking into account the temperature-dependent effective propagation length of thermally excited magnons in the bulk of the material. We further demonstrate that the LSSE peak is significantly shifted by changing the interface coupling to an adjacent detection layer, revealing a more complex behavior beyond the currently discussed bulk effect. By direct microscopic imaging of the interface, we correlate the observed temperature dependence with the interface structure between the YIG and the adjacent metal layer. Our results highlight the role of interface effects on the temperature-dependent LSSE in HM/YIG system, suggesting that the temperature-dependent spin current transparency strikingly relies on the interface conditions.

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“…Spin-flip diffusion lengths of the order of nanometers reported in platinum betray the existence of large interface contributions [25], but the parametrized theory describes transport well [26]. The charge (j c,α ), spin (j αβ ), and heat (j Q,α ) current densities in 014412-2 the normal metals, where the spin polarization is defined in the coordinate system of Fig.…”

Section: A Spin and Heat Transport In Normal Metalsmentioning

confidence: 99%

Magnon spin transport driven by the magnon chemical potential in a magnetic insulator

et al. 2016

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We develop a linear-response transport theory of diffusive spin and heat transport by magnons in magnetic insulators with metallic contacts. The magnons are described by a position dependent temperature and chemical potential that are governed by diffusion equations with characteristic relaxation lengths. Proceeding from a linearized Boltzmann equation, we derive expressions for length scales and transport coefficients. For yttrium iron garnet (YIG) at room temperature we find that long-range transport is dominated by the magnon chemical potential. We compare the model's results with recent experiments on YIG with Pt contacts [L. J. Cornelissen, et al., Nat. Phys. 11, 1022] and extract a magnon spin conductivity of σm = 5 × 10 5 S/m. Our results for the spin Seebeck coefficient in YIG agree with published experiments. We conclude that the magnon chemical potential is an essential ingredient for energy and spin transport in magnetic insulators.

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Giant Room Temperature Interface Spin Hall and Inverse Spin Hall Effects

Cited by 211 publications

References 46 publications

Spin transport at interfaces with spin-orbit coupling: Phenomenology

Spin transport at interfaces with spin-orbit coupling: Phenomenology

Influence of Thickness and Interface on the Low-Temperature Enhancement of the Spin Seebeck Effect in YIG Films

Magnon spin transport driven by the magnon chemical potential in a magnetic insulator

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